Inspection and acceptance of refractory bricks

September 17, 2018

Inspection and acceptance of refractory bricks

Here mainly introduces the inspection and acceptance of refractory bricks, mainly depends on whether it is within the validity period. When an objection is held, it can be identified by sampling to the appraisal department.

The inspection of bricks mainly refers to the on-site inspection of the size, appearance, melting hole, ribs, corners, cracks and distortion of refractory bricks, excluding chemical parts, thermal properties and mechanical properties.

The inspection methods stipulated in the National Standard GB10326 - 2001 (Inspection Method for Size, Appearance and Section of Refractory Products) are as follows:

(1) Sampling and acceptance of refractory products shall be carried out according to GB10325.

(2) The two inspection methods of the same inspection item in the standard have the same status. However, when applicable, an inspection method shall be determined according to the technical requirements of the product.

(3) Other defects in edges and corners are no longer defective in the allowable atmosphere.

(4) All working faces on the specified products shall be inspected in accordance with the standards and those not specified shall be inspected in accordance with the non-working faces. The edges and corners connected to the working face should be inspected according to the working conditions.

(5) When checking the dimensions and protrusions, the brick edges and surfaces must be tidied up, and the attachments and flying edges of the bricks must be removed.

(6) All inspection tools must be inspected. The accuracy of the inspection tool must be corrected regularly on the basis of national standards.

(7) Inspection method of size. Dimensional inspection should follow the following principles:

1) The inspection of the dimensions shall be based on the order drawings.

2) When checking the dimensions, use a steel tape measure to read along the center line of the brick surface. When measuring the inner and outer diameters of the product, use a caliper.

3) For the measurement of the relative margin, the difference between the opposite sides of the same size of the product is measured by a steel tape measure; the measurement of the relative side difference of the product and the female diameter is to measure the difference between the long and short axes of the same sub-port or the female port of the product.

4) Measurement accuracy is accurate to 0.5mm. When the dimensional deviation is expressed as a percentage, its numerical calculation is rounded to an integer according to GB/T8170. When rejecting a batch of bricks measured with a steel tape measure, they should be rechecked with calipers. Rechecks are only limited to oversized bricks.

(8) Inspection method of the molting hole: When inspecting, it is necessary to check the discoloration caused by iron oxide or other low-melting substances to see if there is a potential melting hole. In the case where there may be a cave, gently tap the discolored portion 2 to 3 times with the flat end of a 100g steel hammer. Any exposed holes should be measured and reported.